The Hubble Space Telescope, which orbits Earth and takes pictures of deep space, has captured our cosmos at its most colorful.
A new NASA panorama photo is showing the world how deep and far the universe has gone.
The image is special because it mixes what we can normally see with objects only visible in the ultraviolet light spectrum. This type of light is normally not visible to the human eye. Using special lenses, this light shows up in the photo as bright baby blue with spinning galaxies, which are about 5 to 10 billion years old, not too old or young in cosmic terms.
The speckled photo is also special in another way — it wasn’t done with one snap of the camera. Instead, it’s a composite of more than 800 photos taken by Hubble and that allowed it to show about 10,000 multi-colored galaxies.
Hubble astronomer Zolt Levay said by adding ultraviolet and infrared to the pictures, people can now see the universe in the broad spectrum of color “and then some.”
CLICK HERE FOR A HUGE VERSION OF THE PICTURE!
Reported by The Associated Press from WASHINGTON.
Hey, kids of North and South America, get ready for the first eclipse of the year, but you’ll have to get up really early or stay up really late.
Next Tuesday morning (April 15), the moon will be eclipsed by Earth’s shadow. This total lunar eclipse will be visible across the Western Hemisphere, which includes all of North America. The total shadowed phase will last 78 minutes, beginning at 3:06 a.m. and ending at 4:24 a.m..
Even though the moon is in the Earth’s shadow, it should appear a bit colorful, some shade of red or orange. That’s from light around the edges of the Earth — essentially sunrises and sunsets — splashing on the lunar surface and faintly lighting up the moon, said Alan MacRobert, senior editor at Sky & Telescope magazine.
On April 29, the Southern Hemisphere will be treated to a rare type of solar eclipse.
In all, four eclipses will occur this year, two lunar and two solar.
Reported by MARCIA DUNN of the Associated Press from CAPE CANAVERAL, Fla.Read More
The use of satellites during the search for a lost jetliner has drawn attention to those orbiting platforms. Here is a snapshot of what’s in orbit, with help from Nicholas Johnson, who retired Thursday as NASA’s chief scientist for orbital debris:
HOW MANY SATELLITES ARE UP THERE?
About 1,100 active satellites, both government and private. Plus there are about 2,600 ones that no longer work. Russia launched the first satellite, Sputnik 1, in 1957. The oldest one still in orbit, which is no longer functioning, was launched in 1958.
HOW BIG ARE THEY?
Size varies. Communication satellites can be as big as a small school bus and weigh up to 6 tons, the Federal Communications Commission says. Most weigh a few tons or less. Some that are used briefly are 4 inch cubes and weigh about 2 pounds.
WHAT EXACTLY DO THEY DO?
They have a wide variety of roles: GPS satellites aid navigation, others relay telephone or television signals, others aid in weather forecasting, national defense, science, and agriculture, as in monitoring crops and areas of drought. The Union of Concerned Scientists, a private organization that maintains a database of satellites, says about 60 percent are used for communications.
WHERE ARE THEY?
It depends on their use. Communications satellites relay signals from a fixed spot on the equator, about 22,000 miles up. GPS satellites are at 12,400 miles, high enough to be accessible to large swaths of the Earth. Others that need a closer look at Earth are lower. For comparison, the International Space Station is only about 260 miles high, and very few satellites are lower than that. While some satellites remain over fixed spots on Earth, others fly over both poles or can move from place to place as needed.
You can see their locations at the NASA satellite tracker: http://1.usa.gov/1dyKhCd
HOW HAVE THEY HELPED IN THE SEARCH?
A British communications satellite picked up signals from the plane; analysis of them led authorities to conclude that the airliner crashed in a remote area of the southern Indian Ocean. This week, Thai authorities said one of their satellites spotted 300 objects that might be from the airliner. Some satellites were moved into place to look for debris.
WHO OWNS THEM?
Governments large and small, and private companies. More than 50 countries own a satellite or a significant share in one, according to the Union of Concerned Scientists. There are 502 active satellites with a U.S. tie; 118 for Russia and 116 for China. Thailand has four satellites and shares in another, the scientist group says.
WHAT IF THEY STOP WORKING?
Old satellites can pose a risk for collisions with active ones, so there are rules and recommendations to avoid a buildup of junk in space. Satellites that fly below a certain height are supposed to be put in an orbit that will make them fall to Earth and burn up within 25 years. At high altitudes, they are to be boosted up to still higher orbits to get them out of the way.
Reported by MALCOLM RITTER of the Associated PressRead More
An ambulance whizzes by, and suddenly its siren drops in pitch. We are all familiar with the Doppler effect, even if we don’t know it by name. Now, scientists have found an alternative version of the phenomenon, for when sound, or light, scatters off a rotating object. The discovery could enable astronomers to measure a distant planet’s rotation, or even improve the performance of wind turbines.
Here’s how the Doppler effect works: When a noisy object is moving toward you, its sound waves bunch up, producing a higher frequency, or pitch. Conversely, as soon as the object is moving away from you, the sound waves stretch out, and the pitch lowers. The faster the object, the greater the pitch change.
The Doppler effect occurs for light as well as sound. For instance, astronomers routinely determine how fast stars and galaxies are moving away from us by measuring the extent to which their light is “stretched” into the lower frequency, red part of the spectrum. Redshifts like this were famously used in the 1920s to infer that most stars and galaxies are moving away from us and that the universe must be expanding.
Redshifts in light, and the pitch-drop of passing sirens, are examples of a linear Doppler effect. In recent decades, however, scientists have discovered that the Doppler effect also exists for objects that are rotating, the so-called orbital angular momentum (OAM) of light, and now researchers they believe they can determine how fast a planet is spinning.
Back on Earth, he adds, lasers that measure the OAM could be sent through wind farms to determine the rotation of air currents. “If you’re a windmill, you’d like to know in advance of blustery wind, so you can tether your blades.”
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Reported by JON CARTWRIGHT of ScienceNOW. This is adapted from ScienceNOW, the online daily news service of the journal Science. http://news.sciencemag.orgRead More